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Author : Séverine Catreux
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (494 download)
Download or read book Technique d'antennes "multi-entrées multi-sorties" dans un système de type cellulaire written by Séverine Catreux and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : SEVERINE.. CATREUX
Publisher :
ISBN 13 :
Total Pages : 136 pages
Book Rating : 4.:/5 (78 download)
Download or read book TECHNIQUE D'ANTENNES MULTI-ENTREES MULTI-SORTIES DANS UN SYSTEME DE TYPE CELLULAIRE written by SEVERINE.. CATREUX and published by . This book was released on 2000 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: CE MEMOIRE PRESENTE UNE ETUDE SUR L'EFFICACITE SPECTRALE THEORIQUE DE SYSTEMES DE TRANSMISSION DITS MULTI-ENTREES MULTI-SORTIES, DONT LA CARACTERISTIQUE ESSENTIELLE EST D'UTILISER PLUSIEURS ANTENNES A LA FOIS EN EMISSION ET RECEPTION, DANS LE CADRE DES RADIOCOMMUNICATIONS DE TYPE CELLULAIRE. CETTE TECHNIQUE DE MULTIPLEXAGE SPATIAL PERMET D'ACCROITRE DE MANIERE SIGNIFICATIVE L'EFFICACITE SPECTRALE DES SYSTEMES DE COMMUNICATION QUI EST UN PARAMETRE TRES IMPORTANT POUR LES SYSTEMES DE NOUVELLE GENERATION. LES PERFORMANCES D'UN SYSTEME DE TRANSMISSION COMBINANT LA SITUATION MULTI ENTREES-SORTIES AVEC DE LA MODULATION ADAPTATIVE ET DE LA REUTILISATION DE FREQUENCE, SONT ETUDIES POUR UN GRAND NOMBRES DE SITUATIONS CONCRETES DEFINIES PAR DES PARAMETRES COMME LA CONFIGURATION DES CELLULES, LE CONTROLE DE PUISSANCE ET LES TECHNIQUES DE RECEPTION. UN PREMIER ENSEMBLE DE RESULTATS PRESENTE UNE ETUDE COMPARATIVE DES PERFORMANCES DE TROIS SYSTEMES DEFINIS PAR DIFFERENTS NOMBRES D'EMETTEURS (N) ET DE RECEPTEURS (M). DANS UN ENVIRONNEMENT A UNE SEULE CELLULE, LES SIMULATIONS MONTRENT L'AVANTAGE IMPORTANT DU SYSTEME MIMO (N = 3, M = 3), SUR LES SYSTEMES SIMO (N = 1, M = 3) ET SISO (N = 1,M = 1). UNE COMPARAISON SIMILAIRE EST EFFECTUEE DANS UN ENVIRONNEMENT A PLUSIEURS CELLULES, OU LA DEGRADATION DES RESULTATS DUES AUX CELLULES VOISINES EST QUANTIFIEE ET L'AVANTAGE DU SYSTEME MIMO SUR LE SYSTEME SIMO EST DIMINUE. CET AVANTAGE REMONTE LORSQUE LE NOMBRE DE RECEPTEURS EST PLUS ELEVE ET LE NOMBRE D'ETATS DE LA MODULATION EST CONTRAINT A DES VALEURS RAISONNABLES. CES SYSTEMES SONT EVALUES EN TERME D'EFFICACITE SPECTRALE MOYENNE (MOYENNEE EN TEMPS, SUR TOUTES LES LOCALISATIONS DU RECEPTEUR ET SUR TOUS LES EVANOUISSEMENTS). CEPENDANT, LA DISTRIBUTION DE LA CAPACITE (OU EFFICACITE SPECTRALE) EST AUSSI ETUDIEE EN FONCTION DE LA LOCALISATION DU RECEPTEUR, EN UTILISANT LA PLATE-FORME DE SIMULATION PUIS EN DEVELOPPANT DES EQUATIONS ANALYTIQUES. L'ACCORD ENTRE LES DEUX RESULTATS, ANALYTIQUE ET PAR SIMULATION, EST EXCELLENT..
Author : Philippe Guguen
Publisher : Hermes Science Publications
ISBN 13 : 9782746208834
Total Pages : 238 pages
Book Rating : 4.2/5 (88 download)
Download or read book Les techniques multi-antennes pour les réseaux sans fil written by Philippe Guguen and published by Hermes Science Publications. This book was released on 2004 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cet ouvrage a pour ambition de donner un aperçu général sur les systèmes de communications à entrées multiples et à sorties multiples MIMO (Multiple Input-Multiple Output). Il dresse un panorama des différentes techniques de modulation et de codage espace-temps mises en oeuvre dans ces systèmes.
Author : Sylvain Ranvier
Publisher :
ISBN 13 :
Total Pages : 44 pages
Book Rating : 4.:/5 (69 download)
Download or read book Radiowave propagation and antennas for high data rate mobile communications in the 60 GHz band written by Sylvain Ranvier and published by . This book was released on 2009 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: La bande de fréquence millimétrique autour de 60 GHz est considérée comme l’une des meilleures options pour l’implémentation des réseaux sans fils à très hauts débits de type WPAN (wireless personal area network). De plus, les systèmes multi-antennes de type MIMO (multiple-input multiple-output) sont très prometteurs. Ils peuvent augmenter de manière significative l’efficacité spectrale ou la fiabilité des communications sans fil. De ce fait, l’utilisation de systèmes multi-antennes à 60 GHz est, théoriquement, très prometteuse. Bien que les performances des systèmes MIMO aient été étudiées de manière approfondie à la fois théoriquement et expérimentalement à basses fréquences (2 et 5 GHz), il y a clairement un manque d’évaluation expérimentale de ces systèmes à 60 GHz. De plus, la conception et l’évaluation d’antennes millimétriques compactes à bas coûts pour des applications de type WPAN sont des sujets sur lesquels beaucoup de recherches doivent être encore faites. Dans la première partie de la thèse, le premier sondeur de canal MIMO à 60 GHz est présenté. Ce système, construit à partir d’un sondeur existant pour 2 et 5 GHz, utilise des réseaux d’antennes virtuelles. Afin d’améliorer la résolution temporelle, deux autres systèmes de mesure ont été développés. Le premier est construit à partir d’un sondeur ultra large bande et le second à partir d’un analyseur vectoriel de réseau. Ces systèmes permettent la caractérisation totale du canal MIMO dans les domaines temporel et angulaire. Dans la seconde partie, les performances de techniques pour systèmes multi-antennes sont analysées grâce aux mesures obtenues dans la première partie de la thèse. Les trois techniques étudiées sont: MIMO, MIMO avec sélection d’antennes et dépointage de faisceau. Les résultats indiquent que la capacité du canal MIMO mesuré est relativement proche de celle d’un canal idéal. Dans des conditions réalistes, la capacité obtenue grâce à la technique MIMO avec sélection d’antennes est souvent inférieure à celle obtenue avec la technique MIMO. Par ailleurs, lorsque l’on considère un réseau à déphasage avec des pertes réalistes, il apparait que la capacité obtenue avec la technique MIMO est presque toujours supérieure à celle obtenue avec la technique du dépointage du faisceau. Dans la dernière partie de la thèse, une antenne omnidirectionnelle est présentée. Cette antenne convient parfaitement aux applications de types WPAN car elle est plane et n’utilise qu’une seule couche de métallisation, ce qui la rend facile à réaliser et peut coûteuse. De plus, un banc de mesure quasi-3D de diagrammes de rayonnement d’antennes à 60 GHz à été développé. Ce système a une très bonne répétabilité. Le rayonnement de la pointe elle-même a été mesuré et les résultats indiquent que c’est la principale limitation de la dynamique d’amplitude de ce système.
Author : Anahid Savafi
Publisher :
ISBN 13 :
Total Pages : 144 pages
Book Rating : 4.:/5 (492 download)
Download or read book Contributions pour l'exploitation de la diversité en transmission et en réception dans les systèmes à antennes multiples written by Anahid Savafi and published by . This book was released on 2003 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: Il est bien connu que les réseaux d'antennes peuvent améliorer la performance et/ou le débit des systèmes de communication sans fil dans un environnement à évanouissement. Les réseaux d'antennes peuvent être employés du côté de l'émetteuret/ou du côté du récepteur , créant de la diversité en transmission et/ou en réception.L'objectif de cette thèse est d'étudier, de développer et de combiner des techniques de traitement du signal et/ou de codageafin d'exploiter la diversité en transmission et/ou en réception dans des canaux à évanouissement.Dans la première partie de thèse, consacrée au côté émetteur, nous traiterons particulièrement les aspects du codage spatio-temporel dans le système MIMO (multi-entrées multi-sorties) et nous fournirons une nouvelle architecture spatio-temporelle adaptée au contexte CDMA. Nous examinerons jusqu'où nous pourrons aller en termes de performance, quand nous utiliserons ces schémas de codage.Dans la seconde partie de notre thèse, qui concerne le côté récepteur, nous nous intéresserons aux techniques d'identification aveugle, et en particulier aux méthodes sous-espace. Dans cette partie, nous considérerons les principaux inconvénients des algorithmes d'identification de type sous-espace, tels que le coût de calcul élevé et le manque de robustesse par rapport à la surestimation d'ordre ducanal de propagation. Dans ce cadre, nous présenterons plusieurs algorithmes, qui pallient aux limites de cette technique. Tous lesalgorithmes proposés ont été validés par des simulations.
Author : Krishnanand N. Kaipa
Publisher : Springer
ISBN 13 : 3319515950
Total Pages : 265 pages
Book Rating : 4.3/5 (195 download)
Download or read book Glowworm Swarm Optimization written by Krishnanand N. Kaipa and published by Springer. This book was released on 2017-01-10 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive account of the glowworm swarm optimization (GSO) algorithm, including details of the underlying ideas, theoretical foundations, algorithm development, various applications, and MATLAB programs for the basic GSO algorithm. It also discusses several research problems at different levels of sophistication that can be attempted by interested researchers. The generality of the GSO algorithm is evident in its application to diverse problems ranging from optimization to robotics. Examples include computation of multiple optima, annual crop planning, cooperative exploration, distributed search, multiple source localization, contaminant boundary mapping, wireless sensor networks, clustering, knapsack, numerical integration, solving fixed point equations, solving systems of nonlinear equations, and engineering design optimization. The book is a valuable resource for researchers as well as graduate and undergraduate students in the area of swarm intelligence and computational intelligence and working on these topics.
Author : Andrea Maloney Schara
Publisher :
ISBN 13 : 9780615928791
Total Pages : 318 pages
Book Rating : 4.9/5 (287 download)
Download or read book Your Mindful Compass written by Andrea Maloney Schara and published by . This book was released on 2013-12-01 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Your Mindful Compass" takes us behind the emotional curtain to see the mechanisms regulating individuals in social systems. There is great comfort and wisdom in knowing we can increase our awareness to manage the swift and ancient mechanisms of social control. We can gain greater flexibility by seeing how social controls work in systems from ants to humans. To be less controlled by others, we learn how emotional systems influence our relationship-oriented brain. People want to know what goes on in families that give rise to amazing leaders and/or terrorists. For the first time in history we can understand the systems in which we live. The social sciences have been accumulating knowledge since the early fifties as to how we are regulated by others. S. Milgram, S. Ashe, P. Zimbardo and J. Calhoun, detail the vulnerability to being duped and deceived and the difficulty of cooperating when values differ. Murray Bowen, M.D., the first researcher to observe several live-in families, for up to three years, at the National Institute of Mental Health. Describing how family members overly influence one another and distribute stress unevenly, Bowen described both how symptoms and family leaders emerge in highly stressed families. Our brain is not organized to automatically perceive that each family has an emotional system, fine-tuned by evolution and "valuing" its survival as a whole, as much as the survival of any individual. It is easier to see this emotional system function in ants or mice but not in humans. The emotional system is organized to snooker us humans: encouraging us to take sides, run away from others, to pressure others, to get sick, to blame others, and to have great difficulty in seeing our part in problems. It is hard to see that we become anxious, stressed out and even that we are difficult to deal with. But "thinking systems" can open the doors of perception, allowing us to experience the world in a different way. This book offers both coaching ideas and stories from leaders as to strategies to break out from social control by de-triangling, using paradoxes, reversals and other types of interruptions of highly linked emotional processes. Time is needed to think clearly about the automatic nature of the two against one triangle. Time and experience is required as we learn strategies to put two people together and get self outside the control of the system. In addition, it takes time to clarify and define one's principles, to know what "I" will or will not do and to be able to take a stand with others with whom we are very involved. The good news is that systems' thinking is possible for anyone. It is always possible for an individual to understand feelings and to integrate them with their more rational brains. In so doing, an individual increases his or her ability to communicate despite misunderstandings or even rejection from important others. The effort involved in creating your Mindful Compass enables us to perceive the relationship system without experiencing it's threats. The four points on the Mindful Compass are: 1) Action for Self, 2) Resistance to Forward Progress, 3) Knowledge of Social Systems and the 4) The Ability to Stand Alone. Each gives us a view of the process one enters when making an effort to define a self and build an emotional backbone. It is not easy to find our way through the social jungle. The ability to know emotional systems well enough to take a position for self and to become more differentiated is part of the natural way humans cope with pressure. Now people can use available knowledge to build an emotional backbone, by thoughtfully altering their part in the relationship system. No one knows how far one can go by making an effort to be more of a self-defined individual in relationships to others. Through increasing emotional maturity, we can find greater individual freedom at the same time that we increase our ability to cooperate and to be close to others.
Author : Don Montague
Publisher : Taylor & Francis
ISBN 13 : 9780419199106
Total Pages : 472 pages
Book Rating : 4.1/5 (991 download)
Download or read book Dictionary of Building and Civil Engineering written by Don Montague and published by Taylor & Francis. This book was released on 1996 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.
Author : Norbert Streitz
Publisher : Springer
ISBN 13 : 3540727272
Total Pages : 314 pages
Book Rating : 4.5/5 (47 download)
Download or read book The Disappearing Computer written by Norbert Streitz and published by Springer. This book was released on 2007-07-20 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines how the computer, as we currently know it, will be replaced by a new generation of technologies, moving computing off the desktop and ultimately integrating it with real world objects and everyday environments. It provides a unique combination of concepts, methods and prototypes of ubiquitous and pervasive computing reflecting the current interest in smart environments and ambient intelligence.
Author : International Livestock Research Institute
Publisher : ILRI (aka ILCA and ILRAD)
ISBN 13 : 9789291460038
Total Pages : 268 pages
Book Rating : 4.4/5 (6 download)
Download or read book Livestock Policy Analysis written by International Livestock Research Institute and published by ILRI (aka ILCA and ILRAD). This book was released on 1995-01-01 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Policy concepts; Identification of policy issues; Production systems, supply and demand; Market, price and trade policies; Marketing and distribution systems; Budget and manpower planning; Land tenure police for the livestock sector; Policy analysis report writing and communication; Livestock production and marketing in alphabeta - a case study.
Author : Martin Lindstrom
Publisher : Currency
ISBN 13 : 0385523890
Total Pages : 274 pages
Book Rating : 4.3/5 (855 download)
Download or read book Buyology written by Martin Lindstrom and published by Currency. This book was released on 2010-02-02 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: NEW YORK TIMES BESTSELLER • “A fascinating look at how consumers perceive logos, ads, commercials, brands, and products.”—Time How much do we know about why we buy? What truly influences our decisions in today’s message-cluttered world? In Buyology, Martin Lindstrom presents the astonishing findings from his groundbreaking three-year, seven-million-dollar neuromarketing study—a cutting-edge experiment that peered inside the brains of 2,000 volunteers from all around the world as they encountered various ads, logos, commercials, brands, and products. His startling results shatter much of what we have long believed about what captures our interest—and drives us to buy. Among the questions he explores: • Does sex actually sell? • Does subliminal advertising still surround us? • Can “cool” brands trigger our mating instincts? • Can our other senses—smell, touch, and sound—be aroused when we see a product? Buyology is a fascinating and shocking journey into the mind of today's consumer that will captivate anyone who's been seduced—or turned off—by marketers' relentless attempts to win our loyalty, our money, and our minds.
Author : Rob Flickenger
Publisher : "O'Reilly Media, Inc."
ISBN 13 : 9780596005023
Total Pages : 190 pages
Book Rating : 4.0/5 (5 download)
Download or read book Building Wireless Community Networks written by Rob Flickenger and published by "O'Reilly Media, Inc.". This book was released on 2003 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Building Wireless Community Networks is about getting people online using wireless network technology. The 802.11b standard (also known as WiFi) makes it possible to network towns, schools, neighborhoods, small business, and almost any kind of organization. All that's required is a willingness to cooperate and share resources. The first edition of this book helped thousands of people engage in community networking activities. At the time, it was impossible to predict how quickly and thoroughly WiFi would penetrate the marketplace. Today, with WiFi-enabled computers almost as common as Ethernet, it makes even more sense to take the next step and network your community using nothing but freely available radio spectrum. This book has showed many people how to make their network available, even from the park bench, how to extend high-speed Internet access into the many areas not served by DSL and cable providers, and how to build working communities and a shared though intangible network. All that's required to create an access point for high-speed Internet connection is a gateway or base station. Once that is set up, any computer with a wireless card can log onto the network and share its resources. Rob Flickenger built such a network in northern California, and continues to participate in network-building efforts. His nuts-and-bolts guide covers: Selecting the appropriate equipment Finding antenna sites, and building and installing antennas Protecting your network from inappropriate access New network monitoring tools and techniques (new) Regulations affecting wireless deployment (new) IP network administration, including DNS and IP Tunneling (new) His expertise, as well as his sense of humor and enthusiasm for the topic, makes Building Wireless Community Networks a very useful and readable book for anyone interested in wireless connectivity.
Author : Deryle Lonsdale
Publisher : Routledge
ISBN 13 : 1135973504
Total Pages : 974 pages
Book Rating : 4.1/5 (359 download)
Download or read book A Frequency Dictionary of French written by Deryle Lonsdale and published by Routledge. This book was released on 2009-03-25 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Frequency Dictionary of French is an invaluable tool for all learners of French, providing a list of the 5000 most frequently used words in the language. Based on a 23-million-word corpus of French which includes written and spoken material both from France and overseas, this dictionary provides the user with detailed information for each of the 5000 entries, including English equivalents, a sample sentence, its English translation, usage statistics, and an indication of register variation. Users can access the top 5000 words either through the main frequency listing or through an alphabetical index. Throughout the frequency listing there are thematically-organized lists of the top words from a variety of key topics such as sports, weather, clothing, and family terms. An engaging and highly useful resource, the Frequency Dictionary of French will enable students of all levels to get the most out of their study of French vocabulary. Former CD content is now available to access at www.routledge.com/9780415775311 as support material. Designed for use by corpus and computational linguists it provides the full text in a format that researchers can process and turn into suitable lists for their own research work. Deryle Lonsdale is Associate Professor in the Linguistics and English Language Department at Brigham Young University (Provo, Utah). Yvon Le Bras is Associate Professor of French and Department Chair of the French and Italian Department at Brigham Young University (Provo, Utah).
Author : Rob Flickenger
Publisher : "O'Reilly Media, Inc."
ISBN 13 : 9780596005597
Total Pages : 310 pages
Book Rating : 4.0/5 (55 download)
Download or read book Wireless Hacks written by Rob Flickenger and published by "O'Reilly Media, Inc.". This book was released on 2003 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: Continuing with the successful Hack Series, this title provides real-world working examples of how to make useful things happen with wireless equipment.
Author : Ursula Jakob
Publisher : Springer Science & Business Media
ISBN 13 : 9400757875
Total Pages : 488 pages
Book Rating : 4.4/5 (7 download)
Download or read book Oxidative Stress and Redox Regulation written by Ursula Jakob and published by Springer Science & Business Media. This book was released on 2013-03-15 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many physiological conditions such as host defense or aging and pathological conditions such as neurodegenerative diseases, and diabetes are associated with the accumulation of high levels of reactive oxygen species and reactive nitrogen species. This generates a condition called oxidative stress. Low levels of reactive oxygen species, however, which are continuously produced during aerobic metabolism, function as important signaling molecules, setting the metabolic pace of cells and regulating processes ranging from gene expression to apoptosis. For this book we would like to recruit the experts in the field of redox chemistry, bioinformatics and proteomics, redox signaling and oxidative stress biology to discuss how organisms achieve the appropriate redox balance, the mechanisms that lead to oxidative stress conditions and the physiological consequences that contribute to aging and disease.
Author : Sue Black
Publisher : CRC Press
ISBN 13 : 1420094122
Total Pages : 274 pages
Book Rating : 4.4/5 (2 download)
Download or read book Disaster Victim Identification written by Sue Black and published by CRC Press. This book was released on 2011-05-24 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: Disaster management has become an increasingly global issue, and victim identification is receiving greater attention. By raising awareness through past events and experiences, practitioners and policymakers can learn what works, what doesn’t work, and how to avoid future mistakes. Disaster Victim Identification: Experience and Practice presents a selection of key historical incidents in the United Kingdom and includes candid discussions of potential areas for improvement in preparedness and future deployment capabilities. Real disasters and lessons learned Each chapter in the book addresses a specific disaster and covers a number of main points in relation to the incident. For each event, the book presents data such as the manpower available at the time of the disaster, the number of officers involved in the deployment, and their relevant experience at the time. Details of the disaster follow, as well as the recovery and identification methods employed, the number of fatalities and casualties, and lessons learned. The book also explores the short- and long-term effects that the disaster had on the response team and the community. Finally, each chapter examines important present-day developments in relation to the event. The book summarizes important aspects of the particular disaster in terms of legislative, moral, practical, or other contribution to the field of mass disaster planning, preparation, and deployment on a wider scale. Global input Viewing disaster management from a global perspective, this volume contains the combined input of academics, forensic specialists, trainers, and law enforcement professionals who focus on actual cases to honestly assess events and provide recommendations for improvement.
Author : Jens Amendt
Publisher : Springer Science & Business Media
ISBN 13 : 1402096844
Total Pages : 376 pages
Book Rating : 4.4/5 (2 download)
Download or read book Current Concepts in Forensic Entomology written by Jens Amendt and published by Springer Science & Business Media. This book was released on 2010-01-06 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Forensic Entomology deals with the use of insects and other arthropods in medico legal investigations. We are sure that many people know this or a similar definition, maybe even already read a scientific or popular book dealing with this topic. So, do we really need another book on Forensic Entomology? The answer is 13, 29, 31, 38, and 61. These are not some golden bingo numbers, but an excerpt of the increasing amount of annual publications in the current decade dealing with Forensic Entomology. Comparing them with 89 articles which were published d- ing the 1990s it illustrates the growing interest in this very special intersection of Forensic Science and Entomology and clearly underlines the statement: Yes, we need this book because Forensic Entomology is on the move with so many new things happening every year. One of the most attractive features of Forensic Entomology is that it is multid- ciplinary. There is almost no branch in natural science which cannot find its field of activity here. The chapters included in this book highlight this variety of researches and would like to give the impetus for future work, improving the dev- opment of Forensic Entomology, which is clearly needed by the scientific com- nity. On its way to the courtrooms of the world this discipline needs a sound and serious scientific background to receive the acceptance it deserves.
